Comment 41 for bug 438536

As said by McDavid I think that the best solution will be to put notification (async and sync) in the highest free position available.
Do you remember?
http://www.markshuttleworth.com/wp-content/uploads/2008/12/jaunty904_notifications_example1_web_092.swf
- highest free position
- slide up
- no different position for async and sync (no more confusion or wrong behaviour perception by user)
- integration with indicator-applet